@article{AA_1989_1_4_a6,
     author = {P. A. Zalesskii and O. V. Mel'nikov},
     title = {Fundamental groups of graphs of profinite groups},
     journal = {Algebra i analiz},
     pages = {117--135},
     publisher = {mathdoc},
     volume = {1},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1989_1_4_a6/}
}